Piezo electric crystal holder



PIEZO ELECTRIC CRYSTAL HOLDER Original Filed June 5. 1929 2 Sheets-Sheet l Cokoolv BROWNSCHEIBELL.

Nov. 7, 1933. V a. B. SCHEIBELL 1,933,601

PIEZO ELECTRIC CRYSTAL HOLDER Original Filed June 5, 1929 2 Sheets-Sheet 2 I I II: 7141/11/11. WIIIIIIII I I go'llwll lllln- 7111/! INVE/Y 7' 0/6 60 RDON BRomv Sc/was. 1.

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. 1,933,601 1 Pmzo E o'rarc CRYSTALHOLDERQ.

v Gordonlirown Scheiloell, New Yrk,:N.-Y., as" signer to Radio Corporation of America, New York, N; Y., a corporation ofDelawarew Original application June 5, 1929, Serial No. 368,694,,and in Canada June 5, '1930." Divid'ed and this application March 27, "1933. Serial Nc.662-,993' i l 2 Claims. (01. 171 327) (Granted under the act of1March 188 3 as amended April 30, 1928} 370 Q. G; 757) This -is-a division of' my application S. N. along the line ll'-11' of Fig. 12, illustrating an-- 2368;694; filed June 5,1929. My invention relates other modified form of this invention; Fig. 12 isa broadly "to apparatus forholding piezo electric -vert-ical sectional'viewa'long the line 12-120! crystals. More specifically this invention relates Fig. ll; aridFigplB is a perspective view of the to apparatus for-holding piezo electric crystals spacer employed inthe piezo electric crystal holdofvarious sizes. p ers illustrated inFigs. 11' and 12. g

An object of this invention is to provide an In Fig. 1 of the'drawings, referencenumeral arrangement for holding piezo electric crystals '1 designates'a piezoelectric-crystal holder havemployed in electrical oscillation generators. ing'side walls 2 of insulating material, such as Another objectof-this invention is to provide phenol condensation products, hard rubber or an-arrangement readily adapted for holding the like, atop 3 and a bottom 4. The top and piezo electric crystals of varioussizes which are bottom of the piezo electric crystal holder ememployed in electrical oscillation generators. bodied in this invention are also of insulating Still another object of this invention is to promaterial except in cases where the bottom is vide a piezo electric crystal holder readilyadapt employed as a contacting plate for the piezo ed for holding different size-piezo electric cryselectric crystal, when the bottom is made of v tals, in which a plurality of 'adjustable elements conducting material; such 'as brass, copper or" areassociated with the walls for defining the thelike. The piezo electric crystal 5 is censpace to be occupied by the piezo electric crystal. trally disposed within the holder 1. p A plurality 139 Other objects and features of this invention of pins 6 are forced'into holes provided in the Q will be apparent to those skilled ingthe art to side walls 2. A contact plate 7 is positioned upon f which thisinvention pertains from the following the upper surface of the crystal 5, as illustrated specification and the appended claims. in Fig. 2 of the drawings. A connection is pro- According to this invention a piezo electric vided between the contact plate 7 and the bind- 25 crystal holder is adapted for holding crystals of ing post or terminal 8.

different sizes by providing elements to the side The manner in which the pins 6 are adjusted walls of the holder projecting into the compartto the proper positions is more clearly illustrated ment of the holder for defining the space to be in Figs. 3 and 4 of the drawings.

occupied by the piezo electric crystal and for In Fig. 3 of the drawings, which is a top plan l preventing the crystal positioned in the compartview of the device employed for adjusting the ment from shifting its position. pins 6 of the piezo electric crystal holder 1, con- This invention will be more clearly understood structed in accordance with this invention, the from the following specification and the drawreference numeral 9 designates a flat plate, which ings in which: 1 is preferably of metallic material and which is Figure 1 is a horizontal sectional view along provided with angularly shaped corner members the line l-1 of Fig. 2 of an embodiment of the ll and a centrally disposed plate 10 which. is also piezoelectric crystal holder of this invention; preferably of metallic material. A pair of ex- Fig. 2 is a vertical sectional view along the line tending members 10a, illustrated in Fig. 4, which 2-2 of Fig. 1; Fig. 3 is a top plan view of appais a cross-sectional view along the line 4- 4 of ratus employed in adjusting the piezo electric Figs 3, are formed upon a surface or the plate 1V crystal holder illustrated in Figs. 1 and 2; ii). The memberslllc engage in openings 12 4 is a vertical cross-sectional view along the line provided to the plate 9 and serve to retain the 4--4 of Fig. 3; Fig. 5 is a horizontal sectional view plate 10 in fixed relation with respect to the plate along theline 5-5 of Fig. 6 of another empodi- 9. In adjusting the positions of the pins 6 the ment of the piezo electric crystal holder of this body portion 2 of the holder 1 is placed upon the invention; Fig. 6 is a vertical sectional view plate 9 so that the cavity inside of the body poralong the line 6-6 of 5; Fig. 7 is a vertical sectiontion is disposed symmetrically around theplate a1 viewof another modification of this invention; 10. The pins 6 are then adjusted so that they Fig. 8 is a horizontal sectional view along the. define a polygonal area somewhat larger than 50: line 8 -8 of Fig. 9 of still another modification the area of the piezo electric crystal with which 1053 ofthis invention; Fig. 9 is a vertical sectional the holder is to be used. Different sizes of plates view along the line 9-9 of Fig. 8; Fig. 10 is a 10 are employed for adjusting the crystal holder sectional perspective view of the spacer employed to crystals having difierent areas. in the piezo electric crystal holders illustrated in I A modified form of this invention is illustrated Figsp8 and 9; Fig. 11 is a cross-sectional view in Figs. 5 a d 6 wherein the p 15 positioned 1103* in the body portion 13 of the crystal holder 14, which is circular in shape, are threaded to permit easy and accurate adjustment of the space within the holder to be occupied by the crystal 16. The threaded pins 15 may be cut off flush with the outer faces of the body 13 of the holder 14 after the proper adjustments are made or they may be in the form of screws 17 as illustrated in Fig. 7 so that the space to be occupied by the crystal is readily adjustable.

According to the form of this invention illustrated in Figs. 8 and 9, spacers 21 are tightly fitted into grooves cut into the inner surfaces of the body portion 19 of the crystal holder 20. A detail view of one of the spacers 21 is illustrated in Fig. 10. These spacers may be made of insulating materials, such as phenol condensation products wax impregnated dried wood or the like. Various forms of spacers may be employed in accordance with this invention and where it is more convenient to provide grooves to the upper surfaces of the body portion 22 of the crystal holder 25, illustrated in Figs. 11 and 12, L-shaped spacers 24, which are illustrated in detail in Fig. 13 may be employed. The position of the L-shaped spacers 24 may be adjusted readily with respect to the inner walls of the body portion 22 by adjusting the position of the horizontal portion 24a in the groove. The size of the horizontal portion 24a of the spacer 24 is made such that the spacers will fit tightly into the grooves. Different sizes of spacers 21, illustrated in Fig. 10, and spacers 24 may be used where it is desired to employ the holders for different sizes of piezo electric crystals.

It is apparent that various modifications in the details of this invention may be made without departing from the spirit and scope thereof and that, therefore, I do not desire to limit this invention to the exact details set forth in the foregoing specification except in so far as these details may be defined by the appended claims.

The invention herein described may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. In a universal piezo electric crystal holder, a piezo electric crystal, a frame member surrounding said crystal and having a plurality of grooves cut in faces thereof, a plurality of spacers adapted to fit respectively into said grooves and projecting into the interior of said frame member in juxtaposition with said crystal, said frame member and spacers being of insulating material, a metallic base member carrying said crystal and constituting an electrode therefor, and an upper electrode carried by the upper face of said crystal, whereby said crystal is held in position laterally but not tightly against said spacers.

2. A piezo electric crystal holder comprising, an insulating frame structure in the form of a hollow square providing a crystaltholding chamher and having a plurality of channels disposed in one side thereof, a metallic plate mounted on said frame to close one side of said chamber, a piezoelectric crystal plate mounted directly upon said metallic plate and within said chamber, said crystal plate having the lateral size thereof smaller than the inside of said hollow square, a plurality of L-shaped insulating spacing members each having one part thereof fitted into one of said channels of said frame but flush with the top of said frame, and the other part thereof extending into the inside of said hollow square intermediate said crystal plate and said frame member whereby said spacing members position said crystal within said frame for proper vibration, and a second metallic plate mounted adjacent said frame member in contact with said spacing members and forming a complete seal for said crystal chamber.

GORDON BROWN SCHEIBELL. 

